Baumer BA UNxK09 IO - Manual (Page 5)

en_BA_UNXK 09-IO-Link.doc 5/18 Baumer Electric AG
24.04.2012/haa Frauenfeld, Switzerland
2.3 IODD (IO Link Device Description)
The IODD describes the IO Link device, and can be downloaded at www.baumer.com. It comprises a set of
XML and PNG files. An engineering or diagnostic tool reads a sensor’s IODD in order to determine the
following:
- Identification (manufacturer, designation, part number, etc.);
- Communication characteristics (communication speed, frame type, etc.);
- Parameters and commands;
- Process data;
- Diagnostic data (events).
The IODD determines who is permitted to review and modify which sensor data. How the data are presented
and how they are manipulated is defined by the sensor manufacturer and is therefore independent of the
sensor itself.
3 Sensor in the SIO Mode
In the SIO mode, the sensor operates in accordance with its factory settings or according to the settings
defined by the user via IO Link. The functional scope in the SIO mode is sensor specific.
4 Sensor in the IO Link Communication Mode
4.1 Process Data
With the sensor in the IO Link communication mode, data are periodically exchanged between the IO Link
master and the device. These data comprise process data and possibly commands and parameters for the
sensor. Process data transfer the current measuring value and status bits such as the switch status, quality
information, etc. to the master. The master does not need to explicitly request these process data.
4.1.1 Process Data Structure
Figure 1 illustrates the structure of process data. The following provides a brief description of the individual
information.
Figure 1: Process data
4.1.1.1 Significance of the Measuring Value
The measuring value (Bit4…Bit15) has a range between 0…4095. The measuring value reflects the sensor’s
current measuring range. If the object being measured lies at the start of the measurement value range (e.g.,
30mm), a measuring value of 0 is output. If the object being measured lies at the end of the measurement
value range (e.g., 200mm) a measuring value of 4095 is output.